Question

light enters from air to glass having reflective index 1.5 . what is the speed of light in glass . If speed of light in air is
$3 \times 10 {}^{8} ms {}^{ - 1}$
do it step by step

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Answer 1

Answer:

2 x 10^8

Explanation:

refractive index of material = speed of light in vaccum/ speed of light in that material

refractive index can be written as n

so

n= speed of light in air

------------‐------------‐-------

spped of light in glass

1.5 = 3 x 10^8

---------------

vg(velocity of light in glass)

vg = 3 x 10^8

---------------

1.5

vg = 2 x 10^8 m/s

Hope this will help youu!!